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i <br /> I <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (2091384-2930 <br /> iCertificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Nomellini Construction Method EPA 5030/8015M,8020 <br /> i of Northern California Reference Number 1029 Instrument ID Var GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 3 6-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 3 6-97 <br /> Attn Tim Cuellar Reported 3 9-97 <br /> i <br /> iQUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentralmn 100 1 00 1 00 1 00 1 00 200 <br /> Units ug/L uglL uglL uglL ug/L uglL <br /> LCS Batch # VG 3067W VB-3067W VB 3067W VB-3067W VB-3067W VB-3067W <br /> LCS % Recovery 104% 91 4% 842% 95 2% 91 3% 954% <br /> Surrogate Recovery 102% 99 7% 99 7% 99 7% 99 7% 99 7% <br /> Control Limits 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % 70130 % <br /> iMS/MSD Batch # VG-3067W VB-3067W VB-3067W VB-3067W VB-3067W VB 3067W <br /> IVIS % Recovery 106% 132% -37 3% 882% 77 4% 104% <br /> Surrogate Recovery 102% 989% 98 9% 98 9% 98 9% 98 9% <br /> iMSD % Recovery 110% 110% -650% 79 8% 71 7% 95 8% <br /> Surrogate Recovery 103% 97 6% 97 6% 97 6% 97 6% 97 6% <br />' Relative % Difference 3 16% 18 3% 2 01% 3 96% 1 75% 445% <br /> Methanol Blank ND ND ND ND ND ND <br /> iSurrogate Recovery 101% 100% 100% 100% 100% 100% <br /> iThe LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> of sample batch results Due to matrix effects, the QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> ireject batch results <br /> ANALYSTAPPROVED BY <br /> - 2 <br /> Clarr J Cone J es C Phillips <br /> rnvrronmental Lab Director <br /> I <br />